Comics Should be Good has been running a Top 50 Countdown of the “most notable issue numbers in comic book history,” with the top issue #1, the top issue #2, the top issue #3, etc. They’ve been revealing the numbers in a more-or-less random order, and wrapped up the series today with #4. Their choice: Showcase #4, the 1956 comic in which DC Comics decided to try revitalizing super-heroes with a revamped Flash, and launched the Silver Age of Comics.